Pipe-wrench.



T. HINDS.

PIPE WRENCH.

APPLICATION nun JULY 9, 1913.

1, 1 05,782. Patented Aug. 4, 1914.

. found in plumbing installations the parts be readily released from the mural STAT Efi-QENT FEIGE.

THOMAS KINDS, OF .WINNIPEG, MANITOBA, CANADA.

rs-WRENCH.

Specification of Letters Patent.

Application filed July 9,

in the jaw in which notch it is held by a removable pin 10 The rotary jaw pieces of varying size cut out from the margin thereof leaving relintrant curves 11, 12, 13 and 14.. c

The above completes the description of the parts but I wish now to draw particular attention to the manner in are constructed and arranged.

In constructing the present wrench I have assumed that for all practical purposes it is only necessary to have the wrench grip four sizes of pipes, that isone-half inch,.threequarters inch, one inch and one inch and a quarter as these sizesrof pipes are practically all that are the average To all whom it may concern:

Be it known that I, THOMAS HINDS, city of Winni eg, in theProvince of toba, Canada, ave invented certain new and useful Improvements in Pipe-Vrenchesof which the following is the specification.

The inventionrelates to an improvement inpipe wrenches and the object of the invention is to provide primarily a plumbers Wrench whichflwhen applied will fit and l grip thevarious sizes of pipes customarily being especially designed so that the gripped pipe is not materially marred or injured. A further and important object ofthe invention is to provide a wrench which can pipe the parts being designed so that they are entirely automatic in this regard.

A still further object of the invention is to provide in this type of wrench one aving a renewable gripping section in the stationary jaw. I

WVith the above objects in viewthe inven found in lumbing installation. Further I have concluded that it is impracticable to try and make a serviceable wrench which will grip a large number of varying size pipes. Further I have will use a small or light wrench pipes and a heavy wrench on and would not take a large or heavy wrenc with adjustments a. small pipe was to be gripped. above reasons I find that a wrench adjustments is sufficient purposes.

In designing my now had particularly to Fig.4: I first lay off a base line such as that a--b and then on this base line describe four circles 0, (Z, c and 1 these circles having cated on the base line as at 0, cl, 0' and 1 respectively. The circles are arranged so that their circumferences all touch at one point 9 as indicated. I then sweep an arc of a circle it, this are passing through the point 9 and havin its center located at h on the base line. he radius of this circle is chosen greater than the radius of the circle f. The circles 0, d, e and f so plotted correspond to the actual sizes of the various pipes which the completed wrench is designed to grip and the point 9 represents the contact point of the various pipes with the stationary jaw, this point remaining constant for all pipes. The teeth 7 of the gripping section are designed to fall on the are 71. as indicated in dotted outline in Fig. 4. I next choose a point Z the particular limitation of which is that it must be above the base line. lVith this point as center describe a circle 79 which cuts or intersects the various circles c, d, e and f.

on small tion consists essentially in a stationary jaw extended into a handle and provided with a recess, a renew ble gripping section carried by the jawand a rotary jaw partially contained within the recess and designed to cooperate with the stationary jaw to grip the pipe, the parts being arranged and constructed as hereinafter more particularly described and later-pointed out inthe appended claim.

Figure 1 represents a face view of the wrench with a portion of the handle broken away. Fig. 2 is a side view of the wrench. Fig. 3 represents a vertical sectional view through the wrench. Fig. 4: is a diagrammatic view showing the manner in which the wrench is constructed.

In the drawing like characters of reference indicate corresponding parts in each figure.

1 represents a stationary or permanent jaw which extends into a handle2 of any suitable design. The jaw is recessed at 3 to receive a rotary jaw 4!, he said jaw being mounted on a cross pivot pin 5 carried by the side walls of the recess.

6 represents a removable gripping section which section is let into the stationary jaw and is provided on the one side with a plurality of serrations forming teeth 7 and at the opposite side with an extending log 8, the lug fitting into a suitable notch 9 formed with four Patented Aug. 4,1914.

has I which these parts I found that the average plumber, larger pipes for all pipes where only For the i for all practical.

wrench reference being their centers 10- seen that the rotated to th 10 that these latter reentrant on When the parts ese latter Oirel clrcl the Wn in the remain d Fig. 4, as re'enm ontains 8 p are we rcle p and are S s mg a email p \\t se curves actually hi -gi H A away portlons the rotary l is different radii compr v 11 fi ures, It will be m a, permanent gri points e and of have been stant gripp ng P0111 e POQliJlOl'lS CP, e and f 1T 1 Said t vithin the a 1 ped position. gvhat 1 claim pipe Wrench for lsjgrea-ter than the pipe\s ne grippeoi and D1 plain fully the actual design I11 35 pe .Ahas been shown in the as my invention is".

grippinggpipes of fixed ising ahandi p ing jaw havlnga cont or the various sizes of aw presenting teeth contained p re of a'cirole the radius of which radius oi the kss ges a pivotally mounted 3 by thefha-ndle having hereof cut away to e present- 4 ing the center gripping point of the teeth 7 present suitably spaced reentrant curves, the and the rentrant curves r, s, t and w the out ra 11 of sa1 curves corresponding to the away portions 11, 12, 13 and 14 of the ro radii of the pipes to be gripped, said pivot tary jaw it Will be seen that all the various point being contained in a horizontal plane sizes of pipes Will be gripped by the same located above the center point of the fare point on the stationary aw Which grippin containingth' teeth of the stationary jaw point will be at all times below the pivot pin and the 're'entrant curves being designed so 5, or in other Words contained Withinthe that in the gripped positions of the various base line a-b Furthei it Will be seen that pipes the centers of the reentrant curves lie the various centers of the pipes gripped can on a straight line connecting the fixed grip- 7 never be above the straight line 0 (see Fi ping point of the fixed jaW'With the center" 4) joining the contact point of the pipe with point of the arc, as and for the purpose the stationary jaw and the center of the in specified.

By'virtue of the constructionthe Wrench Signed atWinn-ipeg, this 26 day of May,

in use can ngver loci;1 or;l thglpipe lfiilother 913. i r

Words imnie iately t e an e is Wit rrawn f the rotary jaw Will: turn freely and release THOMAS H the Wrench from the i e. This is a very In the presence of Y important feature and for this reason I have G. ROXBURG seen fit to show diagrammatically and ex- S. SILVERTQ Washington, D. G.

Commissionerof Patents, 

